lisp/ob-ledger.el: Add Eric S Fraga as the maintainer

* lisp/ob-ledger.el: Add Eric S Fraga as the maintainer.

lisp/ob-ledger.el

@@ -3,6 +3,7 @@
 ;; Copyright (C) 2010-2021 Free Software Foundation, Inc.
 
 ;; Author: Eric S Fraga
+;; Maintainer: Eric S Fraga
 ;; Keywords: literate programming, reproducible research, accounting
 ;; Homepage: https://orgmode.org